:root {
  color-scheme: light;
  --ink: #121826;
  --muted: #5a6375;
  --line: #d8dee8;
  --panel: #ffffff;
  --panel-soft: #f5f7fa;
  --teal: #0d766d;
  --teal-dark: #07514c;
  --amber: #c98217;
  --blue: #2563eb;
  --dark: #07111f;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: #ffffff;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  color: #ffffff;
  background: rgba(7, 17, 31, 0.78);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  min-width: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  background: #0d766d;
  font-weight: 800;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.86);
  white-space: nowrap;
}

.nav-download {
  padding: 8px 12px;
  background: #ffffff;
  color: var(--dark);
  font-weight: 700;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  background: var(--dark);
}

.hero-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 17, 31, 0.96) 0%, rgba(7, 17, 31, 0.78) 37%, rgba(7, 17, 31, 0.28) 100%),
    linear-gradient(0deg, rgba(7, 17, 31, 0.88) 0%, rgba(7, 17, 31, 0) 34%);
}

.hero-content {
  position: relative;
  width: min(760px, calc(100% - 36px));
  margin: 0 0 clamp(42px, 9vh, 92px) clamp(18px, 7vw, 92px);
  color: #ffffff;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: #62d2c5;
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 700px;
  margin-bottom: 18px;
  font-size: clamp(42px, 7vw, 82px);
  line-height: 1.02;
  font-weight: 850;
}

.hero-copy {
  max-width: 680px;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(16px, 2vw, 21px);
  line-height: 1.72;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
  border: 1px solid transparent;
  font-weight: 800;
}

.button.primary {
  color: #ffffff;
  background: var(--teal);
}

.button.primary:hover {
  background: var(--teal-dark);
}

.button.secondary {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.34);
  background: rgba(255, 255, 255, 0.08);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  max-width: 660px;
  margin: 32px 0 0;
  background: rgba(255, 255, 255, 0.22);
}

.hero-stats div {
  padding: 16px;
  background: rgba(7, 17, 31, 0.72);
}

.hero-stats dt {
  font-weight: 850;
  color: #ffffff;
}

.hero-stats dd {
  margin: 5px 0 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 13px;
}

.section,
.band,
.download-band {
  padding: clamp(56px, 8vw, 104px) clamp(18px, 4vw, 56px);
}

.section-inner {
  width: min(1160px, 100%);
  margin: 0 auto;
}

.intro {
  background: #eef3f6;
  border-bottom: 1px solid var(--line);
}

.intro-grid,
.download-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(24px, 6vw, 80px);
  align-items: center;
}

.intro h2,
.section-head h2,
.download-grid h2 {
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.16;
}

.intro p,
.download-grid p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.section-head {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-head .section-kicker {
  color: var(--teal);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-card {
  min-height: 230px;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
}

.feature-card:nth-child(2n) {
  background: #f7f9fb;
}

.feature-card .icon {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 22px;
  color: #ffffff;
  background: var(--dark);
  font-size: 13px;
  font-weight: 850;
}

.feature-card:nth-child(3n) .icon {
  background: var(--amber);
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.feature-card p,
.steps span {
  color: var(--muted);
  line-height: 1.72;
}

.evidence {
  background: var(--dark);
  color: #ffffff;
}

.evidence .section-kicker {
  color: #62d2c5;
}

.case-table {
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.case-row {
  display: grid;
  grid-template-columns: 1fr 1.2fr 0.8fr;
  gap: 16px;
  padding: 18px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.84);
}

.case-row:first-child {
  border-top: 0;
}

.case-row.header {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  font-weight: 850;
}

.workflow {
  background: #ffffff;
}

.steps {
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  padding: 0;
  margin: 0;
  list-style: none;
  background: var(--line);
}

.steps li {
  min-height: 210px;
  padding: 24px;
  background: var(--panel-soft);
}

.steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  display: block;
  margin-bottom: 28px;
  color: var(--blue);
  font-size: 28px;
  font-weight: 850;
}

.steps strong {
  display: block;
  margin-bottom: 10px;
  font-size: 19px;
}

.download-band {
  color: #ffffff;
  background: #0b2b35;
}

.download-band .section-kicker {
  color: #9ee7dd;
}

.download-grid {
  grid-template-columns: minmax(0, 1fr) auto;
}

.download-grid p {
  margin: 16px 0 0;
  color: rgba(255, 255, 255, 0.75);
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 22px clamp(18px, 4vw, 56px);
  color: #ffffff;
  background: #050b13;
  font-size: 13px;
}

@media (max-width: 900px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .nav {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    min-height: 860px;
  }

  .hero-content {
    margin-left: 18px;
    margin-right: 18px;
    width: auto;
  }

  .hero-stats,
  .intro-grid,
  .download-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .steps {
    grid-template-columns: 1fr 1fr;
  }

  .case-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 560px) {
  .brand span:last-child {
    font-size: 14px;
  }

  .hero {
    min-height: 840px;
  }

  .hero-stats,
  .feature-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .footer {
    flex-direction: column;
  }
}